Mining machine



2 Sheets-Sheet 1.

No Model.)

' B. A. LEGG.

MINING MAGHINE.

Patented Dec. 13, 1887.

Daratarn 0\ Wmesses/ n. PEYERS. Pholo-Limographu. van-mam 0.0.

- 2 Sheets-Sheet 2.

(No Model.)

B; A. LEGG.

MINING MACHINE.

No. 374,900.. Patented Dec. 13, 1887.

I nventor Witness 65' n. PETERS mwmm mr. WnMnlun. n r;

UNITED STATES PATENT OFFICE,

BENJAMIN A. LEGG, OF COLUMBUS, OHIO, ASSIGNOR TO THE LEOHNERMANUFACTURING COMPANY, OF SAME PLACE.

MINING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 374,900; dated December13, 1887,

Original application filed December 10, 1885, Serial N0.185,2G7. Dividedand this application filed Jnly9,1887. Serial No. 243,$55.

' (N 0 model.)

To ctZZ whom it may concern:

Be it known that I, BENJAMIN A. LEGG, a citizen of the United States,residing at Columbus, in the county of Franklin and State of Ohio, haveinvented certain new and useful Improvements in Mining-Machines, ofwhich the following is a specification, reference beng had therein tothe accompanying drawings.

This inventionrelates to improvements in mining-machines of that classin which each has a bed, a carriage, cutting apparatus on the carriage,power mechanism at the rear of the carriage, two sets of gearingone foradvancing the carriage and the other for withdrawing ita reversibleshaft, and a sliding clutch on the shaft adapted to engage alternatelywith the advancing mechanism and the withdrawing mechanism.

Inasmuch as most of the parts which constitute the mechanism as a wholeare 110w well known, it is not necessary to describe all of them indetail.

Reference may be had to earlier patents-such as that heretofore grantedto me, No. 299,655, dated June 3, 1884, wherein will be foundillustrated a machine adapted to have applied to it the improvements towhich this case relates; but it will be understood that the presentinvention is not limited to a machine all of whose parts are like thosein said patent, as it can be used in any of many modified types, so longas it contains those parts which are necessary to have the presentfeatures applied thereto.

Figure l is a top plan view of sufficient part of a mining-machine toillustrate my improvements. Fig. 2 is a perspective of some of theparts. Fig. 3 is a section of that in Fig. 2. Fig. his a section of thatin Fig. 1, showing a shifting-lever for the clutch above the air-inletor steam-inlet pipes of the engines, as shown in said Fig. 1. Fig. 5 isa similar section, there being here shown a lever for shifting theclutch at a lower point, as in Figs. 2 and 3. Fig. 6 is a cross-sectionof some of the parts in Figs. 2, 3, and 5, it showing, also, thecrossbraces or tie-pieces illustrated in my aforesaid patent, No.299,655.

The bed-frame is indicated by A, it having side bars and cross-bars ofany suitable number and character, as shown in the aforesaid patent, andalso herein at A. The carriage is fitted to the bed and slides to andfro thereon, it having a plate, B, secured to guide-rails b. Thiscarriage carries the cutting apparatus, (not shown,) the engines, thecrossshafting communicating the power to various operative parts, and afeed and recede shaft, is, provided with wheels 70, meshing with racksat a 011 the stationary frame A, and through which the travelingcarriage is fed forward and back in operating the machine. The power istransmitted from the cross-shaftingfg to this shaft k for advancing theframe by an inclined shaft at t, which turns the wheel t", runningloosely on the shaft k and engaging with said shaft through the clutchm, splined to said shaft; butother means may be used instead of theinclined shaftt' and the parts directly incident thereto. The carriageis fed backward or withdrawn by another set or train of devices ofsuitable character-such, for instance, as the chain shown in myaforesaid earlier patent, or by the eccentric and ratchet therein shown,or by means of another shaft, Z, running backward from thecross-shaftingfg. In either case the wheel Z, (whether ratchetwheel,sprocket-wheel, or worm-wheel,) running loosely on the shaft 16, isactuated,which wheel also can be engaged with said shaft 7; through theaforesaid clutch m. The speed of the feed-gearing is lower than that ofthe recedegearing, of whatever sorts the said gearings may berespectively.

The clutch m is operated by means of the sliding rack-bar m, mounted insuitable guides and having parts at m fitting in the annular seat m inthe clutch m. A pinion, n, on the lower end of the vertical bar itengages with the rack-face on the bar in, the said bar it having an arm,U", by means of which,through the pinion n and rack-bar m, the clutch mcan be thrust into and out of engagement with either wheel t" or Z,according to the desired movement of the carriage B b. The bar or shaftn is at the upper end held by.a support, a, secured to the engine partof the machine.

There are plates or standards 0 secured to the carriage and risingupward therefrom,

which carry the engines D and the guides E, and to any of these partsextended upwardly from the carriage the upper end of the bar or shaft11. can be connected. I prefer that the support a" should comprise across-bar secured to each of the engines, but it may be otherwlsearranged. The air-inlet or steam-inlet pipe for the engines is indicatedby F, and extends straight across from engine to engine. There may be anarm or lever, U for operating the clutch above this air-pipe F, as shownin Figs. 1 and 4, or there may be one lower down and nearer the plane ofthe stationary bed, as shown in Figs. 2, 3, 5, and 6.

By interposing a supplemental mechanical movement between the verticalbar or shaft n and the clutch m, I can attain several important ends as,for instance, I can apply greater leverage and can arrange the shiftingmechanism advantageously. NVhile I prefer the position shown for theseparts relative to the clutch, I do not wish to be limited to suchposition, as these parts can be otherwise placed, according as therelative positions of the other parts of the machine may demand, for thesake of convenience or the best application of the power. So,too, whileI prefer to employ a rack and pinion as such movement, I do not wish tobe limited thereto, as other ways of accomplishing the same end willreadily suggest themselves to those acquainted with such machines.

It is now well known that the clutch-shifting devices in mining-machinesmay be operated automatically-that is to say, while the carriage ismoving in one direction or the other upon the bed-frame, and as isillustrated in earlier patents-and the rack and pinion herein shown, orother equivalent devices, can be applied automatically in any of thewell-known ways.

The sliding rack-bar m is held by a guide, M fitted to asupporting-plate, M secured to the under side of the carriage-plate B;but I do not wish to be limited to this as a device for holding thecarriage-shifter in place.

I do not in this case claim any matters claimed in my earlierapplication, No. 185,267, filed December 10, 1885, of which earlierapplication the present one is a division; nor do I claim thecombination, with the feed and recede shaft is and the wheels 70, of theinclined shaft 6, worm-wheel i, and the bevel-gears which drive theshaft 2', nor any other part of the gearing employed for eitheradvancing or Withdrawing the cutting apparatus, reserving the right toclaim such parts thereof as may be patent-able in my said earlierpending applications, Serial No. 185,267, filed December 10, 1885,Serial No. 190,931, filed February 5, 1886, and in the joint applicationNo. 166,299, filed May 21, 1885, by Legg and Dierdorff, preferring tomake the clutch-shifting mechanism the subject-matter of the claimsherein.

What I claim is-* 1. In a mining-machine, the combination of the feedand recede shaft, the wheels Z i, mounted thereon, clutch m, slidingrack-bar m, and clutch-bar 12, carrying the pinion n, meshing with saidrack, substantially as and for the purposes set forth.

2. Ina mining-machine, the combination, with the clutch m, keyed to theshaft is, of the sliding rack-bar m, and clutch-bar in, carrying thepinion a, meshing with said rack-bar and carrying the operating-lever,the upper end of said bar a being supported in the parts projectingupward from the carriage, substantially as set forth.

In testimony whereof I affix my signature in presenoe'of two witnesses.

BENJAMIN A. LEGG.

WVitnesses:

R. S. HARPER, CLIFFORD E. LARZELERE.

